Single vial level



FIG. 1 is a perspective view of a “single vial level” showing my new design;

FIG. 2 is a left end view thereof;

FIG. 3 is a right end view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

CLAIM The ornamental design for a “single vial level”, as shown and described. 